Diesel engine air start system check valves...

Question 1 / 270705eccefa3bacbc34ba4d47d54

Question 1 of 270705eccefa3bacbc34ba4d47d54

Diesel engine air start system check valves are opened by __________.

Question 1 of 27070

Diesel engine air start system check valves are opened by __________.

🔍 Key Concepts

• Purpose of an air start system check valve in a diesel engine • What actually causes a one-way check valve to open in a pressurized system • Difference between mechanically operated valves (cams, springs) and pressure-operated valves

💭 Think About

• Think about whether a check valve in an air start line is normally moved by a rotating part of the engine, or by a pressure difference across the valve disc or poppet. • Consider what condition must exist for air to flow from the starting air manifold into the cylinder but not back the other way. • Ask yourself: does compression inside the cylinder help open the valve, or does it tend to oppose the incoming air?

✅ Before You Answer

• Verify that a check valve is designed to allow flow in only one direction, usually by a pressure differential. • Confirm whether an air start cam usually operates the starting air valve on the cylinder head, not the check valve in the line. • Make sure you can distinguish between a return spring that closes a valve and the force that initially opens it.

Question 1 of 27070

Diesel engine air start system check valves are opened by __________.

an air start cam

cylinder compression pressure

starting air pressure

valve springs